The boards seem to max-out with 8-pin headers, potentially interesting from a high-end OC standpoint, and appear to use similar heatsinks to existing ASRock motherboards from the Z270 family, if not the same. The Z370 Taichi does appear to have a built-up VRM, but without knowing the ICs and FETs, we can’t comment on how good it’ll be at this time.
We’re still in a holding pattern on official information. For now, find all the photos at TPU and Videocardz.